1. EUROnu design System target/horn made of AlBeMet and aluminium
- First calculations
Gérard Gaudiot 30/06/2010

2. Generalities on AlBeMet
AlBeMet® (Brush Willman)
AM162 is a 62% beryllium / 38% aluminium composite
It is a dispersion of Al in Be rather than a true alloy
- low density, high elastic modulus 193 GPa (almost the same as steel) and welding by the same technologies than aluminium (5083 or 5086, with Mg)
** answer in wait for (Mg-Si) **
- disadvantage : health and safety concerns during manufacturing (beryllium dust → disabling lung illness , often fatal)

3. Machinability
- additional set-up due to the safety when machining AlBeMet
- 20% slower speeds as compared to aluminium alloys
→ roughly 25% longer to fabricate than an aluminium alloy
Cost
volume price comparaison : times more expensive than aluminium
→ reduce the amount of AlBeMet

4. To know if they can reduce the AlBeMet volume , it is necessary to make calculations .
Determine the position of separation
simple axisymetrical models
- several positions of joint AlBeMet / Al
continuous regime
- thermal loading (beam power and Joule effect)
- mechanical load (magnetic pressure during a pulse of current)
→ peak of stress in the joint AlBeMet / Al
(Young’ modulus and coefficients of thermal expansion are differents)

5. Properties of materials
AlBeMet
AM162
aluminium
6082-T6
Young’s modulus GPa
193 70
Poissons’ratio
0,17
0,23
density kg/m3
2100
2700
thermal conductivity at 25°C W/m.K
210
180
coefficient of thermal expansion ppm/K
13,9
23,8
electrical resistivity at 25°C Ω.m
for calculation at °C →
3,5.10-8
5.10-8
4,0.10-8

6. - beam : at the same time 1 MW into each system
Data for calculation
→ 4 systems target/horn
- beam : at the same time 1 MW into each system
- peak current in horn 300 kA
pulses
Imax T0 TC
s ,08 s (12,5 Hz)
r.m.s. current : i = Imax .(T0/2Tc)1/2 = A

7. Model and loading axisymetric model Design given by Christoph Bobeth
glass 5
632
532
aluminium 6082-T6
AlBeMet AM162 5 10
R 32
R12
R100 ? mm

8. Magnetic pressure to be checked !!! p = μ0.I² /8π²R² R r
3, N/mm²
p = μ0.I² /8π²r² r
9,95 N/mm²
1,40 N/mm²
Magnetic pressure
to be checked !!!

9. to be continued